JPS57184321A - Schmitt trigger circuit - Google Patents

Schmitt trigger circuit

Info

Publication number
JPS57184321A
JPS57184321A JP7000881A JP7000881A JPS57184321A JP S57184321 A JPS57184321 A JP S57184321A JP 7000881 A JP7000881 A JP 7000881A JP 7000881 A JP7000881 A JP 7000881A JP S57184321 A JPS57184321 A JP S57184321A
Authority
JP
Japan
Prior art keywords
potential
fet16
voltage
source
level
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7000881A
Other languages
Japanese (ja)
Inventor
Hirokazu Fukui
Toshihiko Matsumura
Akihiko Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP7000881A priority Critical patent/JPS57184321A/en
Publication of JPS57184321A publication Critical patent/JPS57184321A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/353—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of field-effect transistors with internal or external positive feedback
    • H03K3/356—Bistable circuits
    • H03K3/3565—Bistables with hysteresis, e.g. Schmitt trigger

Landscapes

  • Manipulation Of Pulses (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To realize an effective change for the switching level of an FET, by switching the potential of a source electrode at the amplifying stage of the input side which forms the FET. CONSTITUTION:When the input voltage increases and exceeds the threshold value of an FET16, the drain current starts to flow to the FET16. Thus the output voltage VA has a drop. When the voltage VA drops less than the threshold level of the 2nd amplifying stage 12, an FET17 is turned off with an FET18 turned on respectively. Then the source voltage VB of the FET16 becomes equal to the earth potential. As a result, the difference of potential increases between the gate and the source of the FET16. The voltage VA drops further to approximate to the earth potential, and the output of the stage 12 is fixed at level H. In other words, a connection line 21 is equal to a positive feedback line. Then the input potential begins to drop from a high level of voltage. Thus the FET16 is not turned off before the source potential of the FET16 drops down to the prescribed threshold value since said potential is set at the earth potential.
JP7000881A 1981-05-08 1981-05-08 Schmitt trigger circuit Pending JPS57184321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7000881A JPS57184321A (en) 1981-05-08 1981-05-08 Schmitt trigger circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7000881A JPS57184321A (en) 1981-05-08 1981-05-08 Schmitt trigger circuit

Publications (1)

Publication Number Publication Date
JPS57184321A true JPS57184321A (en) 1982-11-13

Family

ID=13419138

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7000881A Pending JPS57184321A (en) 1981-05-08 1981-05-08 Schmitt trigger circuit

Country Status (1)

Country Link
JP (1) JPS57184321A (en)

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